Maintenance
Dräger Polytron 5100
21
5.2.1
Zero calibration
!
WARNING
Ambient air can be used to zero the sensor instead of
Nitrogen or Synthetic Air only if the area is known to be
free of the target gas or any gas to which the sensor
may be cross-sensitive (as listed on the sensor data
sheet). In this case, no cylinder or calibration adapter
is needed for the zero calibration.
For Oxygen (O2) sensors the zero cannot be calibrated. For
test purposes only Nitrogen (N2) must be used.
z
Enter the menu and select -0- Adj.
z
Tap [OK].
z
Apply Synthetic Air or Nitrogen.
z
The display will show the current value blinking (e.g. ‘2’).
z
Wait for the value to stabilize.
z
Use [UP] / [DOWN] to adjust the value to 0.
z
Acknowledge with [OK]; the instrument will return to the
main menu.
z
Turn off gas flow and remove the calibration adapter from
the sensor or disconnect tubing.
5.2.2
Span calibration
z
Enter menu and select SPn Adj.
z
Tap [OK].
z
Apply span gas (e.g. 50 ppm CO).
z
The display will show the current value blinking (e.g. ‘48’).
z
Wait for the value to stabilize.
z
Use [UP] / [DOWN] to adjust the value to 50 (or cal gas
cylinder concentration).
z
Acknowledge with [OK]; the instrument will return to the
main menu.
z
Turn off gas flow and remove the calibration adapter from
the sensor, or disconnect tubing.
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